Winterizing the Evaporative Cooler

I finally got around to this chore, now that it's twenty degrees outside. The cold air was pouring into the house through this thing when I got home.

The previous owners left us that piece of plywood, with a cutout for the cords. I added a piece of inch-thick foam insulation board. I had some leftovers, to I added it to the sides as well.

Now there's no noticeable air flow!